| x | − | x | ÷ | 21 20 | × | 1 50 | − | 1 10 | x | + | x | ÷ | 21 20 | × | 1 500 | + | x | ÷ | 21 20 | × | 3 2000 | = | 5000 |
| 方程左边 = | x | − | x | × | 2 105 | − | 1 10 | x | + | x | × | 1 525 | + | x | × | 1 700 | + | 80 |
| = | 619 700 | x | + | 80 |
619 700 | x | + | 80 | = | 5000 |
619 700 | x | = | 5000 | − | 80 |
619 700 | x | = | 4920 |
| x | = | 4920 | ÷ | 619 700 |
| = | 4920 | × | 700 619 |
| x | = | 3444000 619 |
| x | = | 5563.812601 |